利用Sentinel-1A合成孔径雷达干涉时间序列监测陇东地区地面沉降变形

基于覆盖陇东地区同一轨道的97景Sentinel-1A卫星影像，在ISCE和StaMPS数据处理平台上利用PS-InSAR技术进行叠加数据处理，获得研究区自2014年10月至2019年5月的年平均地表LOS向形变场，并对形变场结果进行二维网格滤波处理，获取沉降中心的变化特征。研究结果表明：陇东地区主要存在两类形变，一类是由构造活动引起的地表形变，主要分布在海原断裂与六盘山东麓断裂转换区附近，跨海原断裂年平均形变约为1 mm/a，而六盘山东麓断裂附近断层无明显变形，鄂尔多斯块体内部变形微弱；另一类则是由人类工业活动，如煤矿开采、地下水开采活动等导致的地表沉降，主要影响区域为华亭矿区和宁正矿区，均呈现漏斗状沉降形态，年均最大沉降分别约为8 mm/a和30 mm/a。

Surface Deformation Field of Eastern Gansu Province by PS-InSAR Technique with Sentinel-1A

Through taking 97 Sentinel-1A SAR images from October 2014 to May 2019 covered most parts of Eastern Gansu province as experimental data, we monitored the surface deformation applying PS-InSAR technique for superimposed data processing based on ISCE and StaMPS to obtain the annual mean LOS rate of surface deformation field. Moreover, we filtered the LOS velocity field using two-dimensional mesh filtering to obtain the variation characteristics of the subsidence center. Our results reveal that there have two patterns of surface deformation. (1) Ground deformation caused by tectonic activity mainly locates around Haiyuan fault, whose mean annual LOS rate of deformation is ~1mm/a. However, there is no obvious deformation near the Liupanshan fault. Meanwhile, the internal deformation of the Ordos Block is subtle. (2) Another surficial deformation caused by mining activity occurs in the regions of Huating Mining Area and Ningzheng Mining Area, in which a ground subsidence funnel has been found. According to the time series deformation characteristic analysis of the settlement center, we know the mean annual LOS rate of deformation in the Huating Mining Area and Ningzheng Mining Area are ~8 mm/a and ~30 mm/a, respectively.